40A12 sprockets are a ANSI standard size that has 12 teeth and works with #40 roller chain. These sprockets are known as a "Type A", which is a hubless roller chain sprocket. Our 40A12 plate sprockets are a durable, high strength sprocket that is manufactured from 1045CD carbon steel. After manufacturing, the teeth are hardened to help minimize wear, then a black oxide finish is applied for corrosion resistance.
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